Use the Loop Protection Configuration page to configure the Loop Protection feature. Loops on a network consume resources and can impact network performance. When loop protection is enabled on the switch and on one or more interfaces (ports and trunks), the interfaces send loop protection protocol data units (PDUs) to the multicast destination address 01:80:C2:00:00:08. When an interface receives a loop protection PDU, it compares the source MAC address with its own. If the MAC addresses match, a loop is detected and a configured action is taken, which may include shutting down the port for a specified period. An interface can also be configured to receive and take action in response to loop protection PDUs, but not to send out the PDUs itself.
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Loop Protection Configuration Fields
| Field | Description |
|---|---|
| Loop Protection | Enables or disables the loop protection feature globally on the switch. The loop protection feature is not supported on dynamic trunks. The loop protection feature will be automatically disabled if it was previously enabled on a static trunk that is now configured as dynamic. |
| Transmission Time (Seconds) | The interval at which the switch sends loop protection PDUs on interfaces that are enabled to send them. |
| Maximum PDU Received | The count of loop protection packets received by the switch after which the interface will be err-disabled. |
| Interface | The port or trunk ID. Select an interface and click Edit to edit the Loop Protection port configuration. Click Edit All to apply the same configuration to all interfaces. |
| Action | The action to be taken when a loop is detected on the port:
|
| Status | The current status of the interface. Link Up indicates the interface is operating normally. Link Down indicates that the port has been shut down due to the detection of a loop. |
| Loop | Whether a loop is currently detected on the interface. If blank, then no loop is detected. |
| Loop Count | The number of times a loop has occurred on the interface. |
| Time of Last Loop | The date and time the most recent loop was detected. |
Click Submit to updated the switch. The changes take effect but will not be retained across a power cycle unless a save is performed.
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